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Sweetgrass Comm Co Water Sewer Dist

Sewage treatment plant, Sweet Grass, Montana. NPDES permit MT0031437 expired Jan 31, 2023; its limits still apply. Last 12 months: no values over a limit, 1 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (18 values), form Q quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (28)

ParameterStatisticLimitMonths
Flow ratemaximum monthly geometric meanreport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 5.1 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 7.7 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Csingle samplereport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 5.1 lb/dall year
Solids, total suspended7-day average≤ 7.7 lb/dall year
Solids, total suspendedsingle samplereport only (mg/L)all year
Nitrogen, total [as N]single samplereport only (mg/L)all year
Nitrogen, total [as N]quarterly maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]single samplereport only (mg/L)all year
Nitrite + Nitrate total [as N]single samplereport only (mg/L)all year
Phosphorus, total [as P]single samplereport only (mg/L)all year
Phosphorus, total [as P]quarterly maximumreport only (lb/d)all year
E. coli, MTEC-MF30-day geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF30-day geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFdaily maximum≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFdaily maximum≤ 252 CFU/100mLApr–Oct
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Montana's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0031437 · MCP: https://passage-data.com/mcp